Ludvigson, Sydney C <br/><br/>
Uncertainty and business cycles :  Exogenous impulse or endogenous response ? / 
Sydney C. Ludvigson, Sai Ma and Serena Ng 
 - Cambridge  NBER  2015 
 - 65p 
 - NBER Working Paper ;  21803 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>NBERWP 21803<br/>E16223.pdf